Question: what is work location of theo van doesburg that is point in time is 1929-1-1?
Paraphrase: Where did Theo Van Doesburg work in 1929
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q160422 p:P937 ?s . ?s ps:P937 ?obj . ?s pq:P585 ?x filter(contains(YEAR(?x),'1929')) }